Certificate of authenticity · Verification code YMG5J4B6AM · Version 1
brandelli di nuvole II
Tim Berresheim
| Inventory number | TB14/E 41 |
|---|---|
| Year | 2014 |
| Technique | Risographie |
| Dimensions | 44 × 31 cm |
| Edition | 40 |
| Issued | 10.11.2026, 06:32 |
Timestamp anchored in Bitcoin, block 975269.
Verification
- …Checksum of the certificate file
- …Artist’s signature
- …Timestamp in Bitcoin
- ·ImageDrop the image file here to compare it with the certificate.
Drop a file here: image, certificate (.json), signature (.sig) or timestamp (.ots). Nothing is uploaded; everything is computed in your browser.
Verification data
- SHA-256 of the certificate file
6f24868f7414d503eba72aedbb6412fc15ca9a6f37813dded6267b05a7567e7b- Signature (Ed25519, Base64)
WctMek2V3RFEp2doIoMSzZNiBcyifm+ylQbE4Y5+4aOcouRWCEKgwQdmjknX1znYGdOcGzUqxvF5oUj+zedbAw==- Artist’s public key
0a347c3cdcf869a45213eb6eea4e65d4f60adb6d1fe7d9be59eace1f04584708- SHA-256 of the main image
6d667fdb85b42ca5467a1eeed6013dd70c850556b5ff33d05cabb6a44a7c203f
How to verify this independently of this page: hash the JSON file with SHA-256; the value must match the checksum above. Verify the signature against that checksum with the public key (Ed25519). Check the .ots file together with the JSON file at opentimestamps.org: this proves since when the checksum has been in the Bitcoin blockchain. The proof depends neither on this address nor on the artist, only on certificate, key and blockchain.